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2. Carabiner - Wikipedia

   en.wikipedia.org/wiki/Carabiner

   Center is a standard carabiner rating. Using a carabiner to connect to a rope. A carabiner or karabiner (/ ˌ k ær ə ˈ b iː n ər /), [1] often shortened to biner or to crab, colloquially known as a (climbing) clip, is a specialized type of shackle, a metal loop with a spring-loaded gate [2] used to quickly and reversibly connect components, most notably in safety-critical systems.

3. Automatic center punch - Wikipedia

   en.wikipedia.org/wiki/Automatic_center_punch

   The most common mechanism is based upon the Sweet patent. Within the body of the punch, there are three principal moving parts arranged in line: The punch; The intermediate rod (tumbler) The hammer (hammer mass) The hammer mass is spring-loaded from the back of the punch by a large spring. (The spring's preload compression can usually be ...

4. Spring pin - Wikipedia

   en.wikipedia.org/wiki/Spring_pin

   A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole.

5. Lockset - Wikipedia

   en.wikipedia.org/wiki/Lockset

   Metal fire-resistance rated door with a lockset consisting of a locking latch bolt operated by lever handle with an escutcheon that encompasses the locking mechanism.. A lockset (alternatively lock set) is the hardware and components that make up the locking or latching mechanism that can usually be found on a door or other hinged object but can also include sliding doors and dividers. [1]

6. Spring (device) - Wikipedia

   en.wikipedia.org/wiki/Spring_(device)

   Helical coil springs designed for tension A heavy-duty coil spring designed for compression and tension The English longbow – a simple but very powerful spring made of yew, measuring 2 m (6 ft 7 in) long, with a 470 N (105 lbf) draw weight, with each limb functionally a cantilever spring. Force (F) vs extension (s).

7. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   Modern manual door closer Eclipse door spring and separate checking mechanism A door closer is a mechanical device that regulates the speed and action of a door ’s swing. [ 1 ] Manual closers store the force used to open the door in some type of spring and reuse it to close the door.